// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include "common/common_types.h"
#include "shader_recompiler/exception.h"
#include "shader_recompiler/frontend/maxwell/translate/impl/common_encoding.h"
#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"

namespace Shader::Maxwell {
namespace {
void FFMA(TranslatorVisitor& v, u64 insn, const IR::U32& src_b, const IR::U32& src_c, bool neg_a,
          bool neg_b, bool neg_c, bool sat, bool cc, FmzMode fmz_mode, FpRounding fp_rounding) {
    union {
        u64 raw;
        BitField<0, 8, IR::Reg> dest_reg;
        BitField<8, 8, IR::Reg> src_a;
    } const ffma{insn};

    if (sat) {
        throw NotImplementedException("FFMA SAT");
    }
    if (cc) {
        throw NotImplementedException("FFMA CC");
    }
    const IR::U32 op_a{v.ir.FPAbsNeg(v.X(ffma.src_a), false, neg_a)};
    const IR::U32 op_b{v.ir.FPAbsNeg(src_b, false, neg_b)};
    const IR::U32 op_c{v.ir.FPAbsNeg(src_c, false, neg_c)};
    const IR::FpControl fp_control{
        .no_contraction{true},
        .rounding{CastFpRounding(fp_rounding)},
        .fmz_mode{CastFmzMode(fmz_mode)},
    };
    v.X(ffma.dest_reg, v.ir.FPFma(op_a, op_b, op_c, fp_control));
}

void FFMA(TranslatorVisitor& v, u64 insn, const IR::U32& src_b, const IR::U32& src_c) {
    union {
        u64 raw;
        BitField<47, 1, u64> cc;
        BitField<48, 1, u64> neg_b;
        BitField<49, 1, u64> neg_c;
        BitField<50, 1, u64> sat;
        BitField<51, 2, FpRounding> fp_rounding;
        BitField<53, 2, FmzMode> fmz_mode;
    } const ffma{insn};

    FFMA(v, insn, src_b, src_c, false, ffma.neg_b != 0, ffma.neg_c != 0, ffma.sat != 0,
         ffma.cc != 0, ffma.fmz_mode, ffma.fp_rounding);
}
} // Anonymous namespace

void TranslatorVisitor::FFMA_reg(u64 insn) {
    FFMA(*this, insn, GetReg20(insn), GetReg39(insn));
}

void TranslatorVisitor::FFMA_rc(u64) {
    throw NotImplementedException("FFMA (rc)");
}

void TranslatorVisitor::FFMA_cr(u64 insn) {
    FFMA(*this, insn, GetCbuf(insn), GetReg39(insn));
}

void TranslatorVisitor::FFMA_imm(u64) {
    throw NotImplementedException("FFMA (imm)");
}

void TranslatorVisitor::FFMA32I(u64) {
    throw NotImplementedException("FFMA32I");
}

} // namespace Shader::Maxwell